* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-size: .94rem
}

@media screen and (max-width: 320px) {
    html {
        font-size: 12px;
    }
}

@media screen and (min-width: 320px) and (max-width: 360px) {
    html {
        font-size: 14px;
    }
}

@media screen and (min-width: 360px) and (max-width: 400px) {
    html {
        font-size: 16px;
    }
}

@media screen and (min-width: 400px) and (max-width: 440px) {
    html {
        font-size: 18px;
    }
}

@media screen and (min-width: 440px) and (max-width: 480px) {
    html {
        font-size: 20px;
    }
}

@media screen and (min-width: 480px) and (max-width: 520px) {
    html {
        font-size: 22px;
    }
}

@media screen and (min-width: 520px) and (max-width: 560px) {
    html {
        font-size: 24px;
    }
}

@media screen and (min-width: 560px) and (max-width: 600px) {
    html {
        font-size: 26px;
    }
}

@media screen and (min-width: 600px) {
    html {
        font-size: 28px;
    }
}

html {
    color: #333;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

/* 内外边距通常让各个浏览器样式的表现位置不同 */
body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td,
hr,
button,
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
    margin: 0;
    padding: 0;
    color: #333;
}

html,
body {
    width: 100%;
    height: 100%;
}

.under_bg_container {
    background: url("../images/icon_750x1334.png") no-repeat;
    background-size: 100% 100%;
    width: 100%;
    height: 100%;
    display: -moz-box;
    display: flex;
    /*safari*/
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;

    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;

    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
}

.downloadBtn {
    -webkit-box-flex: 1;
    -ms-flex: 1;
    -webkit-flex: 1;
    flex: 1;    
    display: block;
    height: 2.5rem;
    background-color: #fff;
    position: fixed;
    bottom: 2.5rem;
    width: 12.5rem;
    border-radius: 1.25rem;
    font-size: 1.125rem;
    text-align: center;
}

.downloadBtn a {
    text-decoration: none;
    color: #ff8e3a;
    display: inline-block;
    width: 12.5rem;
    height: 2.5rem;
    line-height: 2.5rem;
}

.cover_level {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    background-color: #000000;
    z-index: 1001;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.loading_level {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    background-color: #ffffff;
    z-index: 1001;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.outside_box {
    display: none;
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 14.375rem;
    height: 5.31rem;
    background: url("../images/icon_520x140.png") no-repeat;
    background-size: 100%;
    z-index: 9999;
}

.swiper_box {
    display: none;
    width: 16rem;
    height: 26.875rem;
    position: fixed;
    top: 7.87rem;
    background: url("../images/backdrop3.png") no-repeat;
    background-size: 100%;
    z-index: 99999;
}

.swiper-container {
    width: 16.5625rem;
    height: 13.4375rem;
    margin-top: 4rem !important;
}

.swiper-slide {
    width: 16.5625rem;
    height: 13.4375rem;
    color: #ffffff
}

.item1 {
    background: url("../images/icon_530x430_1.png") no-repeat;
    background-size: 100%;
}

.item2 {
    background: url("../images/icon_530x430_2.png") no-repeat;
    background-size: 100%;
}

.item3 {
    background: url("../images/icon_530x430_3.png") no-repeat;
    background-size: 100%;
}

.item4 {
    background: url("../images/icon_530x430_4.png") no-repeat;
    background-size: 100%;
}